Luckily I have only hard job taking the iron heads, putting back GT-40 58cc alumium heads M-6049-X305, does anyone know if they are worth their price ?
GT40 and GT40P are worth it, if you can get them $200 USD each or cheaper. If you have to pay much more than that, I would go aluminum. I have Ps and they are GREAT heads, just little hassle with spark plugs if you have headers. The non-P are easy to get to the plugs, and highly recommended for iron heads.
